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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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FUEL GAUGE READING IS NOT CORRECT [INSTRUMENT CLUSTER]

NOTE:

  • If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [INSTRUMENT CLUSTER] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [INSTRUMENT CLUSTER].)

Possible cause

  • Instrument cluster malfunction

  • BCM malfunction

  • Fuel gauge sender unit malfunction

  • Open or short circuit in wiring harness between fuel gauge sensor unit and BCM

Diagnostic Procedure

Step

Inspection

Action

1

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

2
    INSPECTION OF INSTRUMENT CLUSTER

  • Perform inspection of the fuel gauge/multi-information display referring to the instrument cluster inspection.

    (See INSTRUMENT CLUSTER INSPECTION.)

  • Is the display normal?

Yes

Go to the next step.

No

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

3
    DETERMINE IF MALFUNCTION CAUSE IS FUEL GAUGE SENDER UNIT

  • Display the following BCM PIDs using the M-MDS.

    • FUEL_SEN_M

  • Verify the voltage in the display monitor while shaking the vehicle.

  • Does the voltage change?

Yes

Go to the next step.

No

Go to Step 5.

4
    DETERMINE IF MALFUNCTION CAUSE IS BCM

  • Display the following instrument cluster PIDs using the M-MDS.

    • FUEL_SEN_M

  • Verify the resistance in the display monitor while shaking the vehicle.

  • Does the resistance change?

Yes

Replace the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

5
    INSPECT FUEL GAUGE SENDER UNIT

  • Switch the ignition off.

  • Inspect the fuel gauge sender unit.

    (See FUEL GAUGE SENDER UNIT INSPECTION.)

  • Is the fuel gauge sender unit normal?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the fuel gauge sender unit and the BCM.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the mid-wiring harness for a short to power supply.

  • Repair or replace the wiring harness which has a malfunction.

    If there is no common connector:

  • Repair or replace the wiring harness which has a malfunction.

No

Replace the fuel gauge sender unit.

(See FUEL GAUGE SENDER UNIT REMOVAL/INSTALLATION.)
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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